Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SPH callsign genealogy
Currently held by Hanneman, Steven P
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by K4SPH's current licensee, walking backwards.
- Hanneman, Steven PFLgranted 2024-10-16cancelled 2025-03-11
Successor callsigns
Callsigns held now by people who previously held K4SPH.
- Hanneman, Steven PFLgranted 2024-10-16cancelled 2025-03-11
All historical holders
Every license row we've seen with the callsign K4SPH, oldest first.
- Hanneman, Steven P FL2022-04-23 → cancelled 2024-10-16
- Hanneman, Steven P FL2025-03-11 active